Improvement in stove-pipe thimbles



A UNITED STATES FREDERICK TARRANT, OF SARATOGA SPRINGS, NEW YORK. i

IMPROVEMENT IN STOVE-PIPE THIMBLES.

Specification forming part of Letters Patent No. l 39,210, dated May 20,1873,' application tiled March 22, 1873.

`telescopic stove-pipe thimble, composed of two sections held togetherby interlocking spiral beads upon their respective surfaces. The outerend of each section terminates in a circumferential iiange, so that whenthe thim ble has been properly inserted in the hole of the floor, `theflange of one section will bea-r against the under side and the liangeof the other section against the upper side of the door. i

y Figure l is an elevation of my improved stove-pipe thimble. Fig. 2 isan axial section thereof.

The two sections of the thimble consist of tin or other sheet-metaltubes, A and B, which are respectively provided at one end with flanges,A and Bf, and with their other ends tted Within each other. Spiral beadsor grooves, a and b, are formed in the surfaces of the` tubes, adaptedto interlock and prevent the tubes from slipping on each other, exceptby revolving one or both of them. The flanges have each a short ring, a1and b1, entering the ends of the tubes, and are secured to the latter byrivets, or in any other preferred manner. The anges project both outwardand inward from the tubes, their inner diameter fitting the'stove-pipebetween which and the tubes A and B an annular airspace will be formed,

holes being formed in the inwardly-projectin g portions of the fianges,as at a? and b2, to admit of a free circulation of air, as ususaL Lugsa3 and b3 are formed along the interior i i edges of the flanges for theattachment oi'` additional tubes, in case they are desired.

Ordinarily, I propose to make the thimble single-walled only, inthemanner shown in the drawing.

In applying the thmble, one of the sections 1 is inserted from the underside of the Hoor, and

the other section screwed into it from the upper side of the door untilthe anges are drawn tightly against the latter `upon both sides, inwhich position the sections ofthe thimble willbe securely held by theinterlocking spiral beads, the anges making a neat finish around bothends of the aperture lined` A telescopic stove-pipe thimble, the tubes py A and B of which are provided at. their outer ends with flanges A' andB', and have inter- 10Cking spiral beads a a-lld b, substantially as andfor the purpose specile i In testimony whereof I have signed my*` nameto this specili'cation in the presence of two subscribing witnesses.

FREDERICK TARRANT.

Witnesses J. W. CRANE', HIRAM PALMER.

PrxJriJlwJzV OFFICE.l

